Fabrication and measurement of the performance of a printed EMI shielding mesh filter on PET film
Fabrication and measurement of the performance of a printed EMI shielding mesh filter on PET film
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DOI：
10.1007/s12541-011-0022-y
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发表时间：
2011-02
影响因子：
1.9
通讯作者：
C. Kim;Yongshik Lee
中科院分区：
文献类型：
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作者：
C. Kim;Yongshik Lee
本文采用丝网印刷法制备了屏蔽电磁干扰（EMI）的网状过滤膜。EMI屏蔽网状滤波器需要30 μm以下的细线图案，因此需要具有细线丝网的丝网掩模，以及由细金属颗粒组成的合适墨水。此外，由于印刷的EMI屏蔽滤波器必须在PET膜上制造，因此油墨应在低于150°C的温度下烧结，以使膜不变形。为了本研究的目的，使用了具有20 μm线掩模的丝网，以及烧结温度为140° C的油墨制成的纳米银浆料，其可以保证PET上的细线图案化。油墨的粘度为90，000 - 12，000 cps，金属含量为85重量%。印刷的EMI屏蔽网具有约24 μm的线宽和约2.5 μm的厚度。测得的表面电阻为0.5 Ω/□ ~ 0.7 Ω/□，作为EMI网提供了良好的电气性能。使用简单的测量系统来评估印刷的EMI屏蔽网的电屏蔽性能。印刷的EMI屏蔽网与没有网的纯膜和铜片的比较揭示了印刷的EMI屏蔽网确实能够提供良好的电气性能。
In this paper, Electromagnetic interference (EMI) shielding mesh filter films are fabricated using the screen printing method. An EMI shielding mesh filter requires fine line patterns under 30 μm, therefore, the screen masks with fine-line screen mesh, as well as suitable ink composed of fine metal particles are required. Moreover, because the printed EMI shielding filter has to be fabricated on a PET film, the ink should be sintered at a temperature below 150°C not to deform the film. For the purposes of this study, a screen mesh with a mask of 20 μm line, and ink made nano silver paste with a sintering temperature of 140°oC, which could guarantee fine-line patterning on the PET, were used. The ink had a viscosity of 90,000–12,000 cps and metal content of 85% in weight. The printed EMI shielding mesh had a line width of about 24 μm and a thickness of about 2.5 μm. The measured surface resistance was 0.5∼0.7 ω/□, offering good electrical performance as an EMI mesh. A simple measurement system was used to evaluate the electrical shielding performance of the printed EMI shielding mesh. A comparison of the printed EMI shielding mesh with pure film without mesh and copper sheet revealed that the printed EMI shielding mesh is indeed capable of providing good electrical performance.